VIDEO : Ariana Grande and Nathan Sykes Reunite for New Collaboration

Even though Ariana Grande and Nathan Sykes decided to call it quits in 2013 after dating for several months, the duo came together for a new version of the former Wanted singer's love ballad "Over and Over Again." Sykes debuted the new track on Friday, and the only thing that's changed about it is the addition of Grande's incredible vocals." The former boybander originally teased the updated song on Twitter last week, noting that there was "another version" to come with a "very special feature." Low and behold, it's his ex-girlfriend!